Pool balls are 2 1/4". Where does 2 1/8" come into play? I would imagine based on your screen name, that's what it is. I've never played snooker or had a table available or know the exact size of the balls.
I think the snooker balls are 2 1/16 but there maybe some in use that are 2". My vintage 1962 brunswick table which is only 33 x 66" runs 1 7/8 balls.
from wikipedia : Snooker balls are standardized at
52.5 mm (2 1⁄16 in) in diameter..
if they were bigger the table would be too crowded to be practical, the black ball would be too close to the reds. As it is my small dimension Brunswick can only run a rack of 12 not 15 like a normal 12' snooker table. Brunswick reduced the ball size to compensate for the small table size. the 1 7/8 aren't common in the US and Canada, they might be in Britain.
I don't play on the tiny diamond tables but they seem popular, it must make for a very crowded table by comparison to a more normal sized pool table due to the same problem. Diamond reduced the table size and threw things out of proportion by not also reducing the ball size proportionally. It seems many who wanted to play in 9 ball tournaments accepted it and it became commonplace and then even sort of "normal"..
so I actually use 3 sizes, 7/8 , 2 1/16, and 2 1/4
a cut shot to each, if they were all placed 3' away would be a different angle. If you think in terms of a ghost ball as the target, as the ball size changes so does the angle required for a thin cut.
I dont know what system I use, maybe somewhere between "Guess" and "Hope" ;-) I sometimes try to imagine a ghost ball and shoot for the center of that and usually it just throws me off.. same for trying to aim at the edge of a ball in a 1/2 ball shot. I can see how people are breaking that down into fractions and guaging their distance from the surface of the ball in or out, putting that to use at 12' away seems like a way of distracting myself, but maybe the idea has merit.
somehow I can do it and seem to slowly progress but I often wonder by what mechanism I improve.. I don't think Im good at taking the info from a miss and saying to myself that was too thin or too thick and then upon next turn implementing all that into self improvements.
By some unexplained mechanism we still learn.. the proof is in the improvements.
Repeating shots in drills may help self adjustments register faster because you are then using repetition and can then focus and take input on those minor adjustments. I find I get bored with that really fast but it may help if i can find a way not to just get so bored..
I keep thinking that if I can recognise and register my faults while shooting more efficiently than I do, rather than just shrugging and walking away. I should then also be able to teach mysef to learn faster.
Perhaps micro focussing on every fault can make one loose confidence too.. It might be sometimes best to just shrug it off like last weeks girlfriend and continue on, thus not loosing confidence through continuous self criticism..
I know confidence does play a big role too so it's a matter of learning but also keeping the learning in balance with play and trying to not get too caught up in it all.
I think what i do with the harder shots is just try even though I know it is reducing the chance of a win sometimes you just need ot try and see..
In snooker the number of rails you are often playing wiht both balls, and the angles involved can be a bit confusing and in time I think we work out patterns and see what works.. what can seem like a really random shot with balls running all over eventually becomes a recognizable and predictable pattern. It takes time.